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Add/Drop	Name	Reference	Plots↓	Description
Comm #791	Phalaris arundinacea Western Marsh » more details accession code: urn:lsid:vegbank.org:commConcept:30383-{F55700F7-0B67-4814-92A6-B10EE52933E5}	NatureServe Biotics 2019	24	This herbaceous association is reported from throughout Washington, Colorado, Nebraska, Montana, Idaho, and into northeastern Utah, but is likely more widespread in the western United States. It also occurs in Canada , in the southern two-thirds of British Columbia in areas with warm and relatively dry summers and in Alberta, from the Great Plains north into the Boreal Plains. Its distribution as a natural type is complicated because this native species is widely cultivated as a forage crop and has escaped and established in wetlands and riparian areas, displacing the local flora. Elevations range from near sea level to 2307 m. Stands are found along riparian areas, pond and lake margins, wet meadows, and intermittent drainages. The poorly drained alluvial soils are commonly fine-textured (occasionally coarse-textured) and may be flooded for brief to extended periods. The vegetation is characterized by a dense, tall herbaceous layer (often &gt;80% canopy cover and 1.5-2 m tall) that is dominated by <i>Phalaris arundinacea</i>, which tends to occur in monocultures. Associated species may include <i>Equisetum arvense, Muhlenbergia asperifolia, Mentha arvensis, Schoenoplectus acutus</i>, and many other species in trace amounts where disturbed. Introduced species such as <i>Agrostis gigantea, Bromus inermis, Bromus tectorum, Cirsium arvense, Elymus repens, Euphorbia esula, Hordeum brachyantherum, Lepidium latifolium, Melilotus officinalis, Phleum pratense, Poa pratensis</i>, and <i>Sonchus oleraceus</i> are common in some disturbed stands.
Comm #792	Picea glauca - Abies balsamea - Populus tremuloides / Mixed Herbs Forest » more details accession code: urn:lsid:vegbank.org:commConcept:31383-{CCDA1102-3B6B-4097-9CEC-2B00C09B7C5B}	NatureServe Biotics 2019	24	This spruce - fir - aspen forest is found in the subboreal region of the western Great Lakes area of the United States and Canada and elsewhere in parts of central Canada. Stands occur on deep, well-drained to rapidly drained, moist, fine-textured mineral soils. Loams are the most common, but silts and clays are also possible. The overstory is a mixture of coniferous and deciduous trees. Species composition is varied. The most abundant tree species are <i>Abies balsamea, Acer rubrum, Picea glauca, Pinus strobus, Populus tremuloides</i>, and <i>Populus balsamifera</i>. The sapling/shrub layer is usually moderately well-developed. <i>Acer spicatum, Corylus cornuta, Rosa acicularis, Rubus pubescens</i>, and saplings of <i>Abies balsamea</i> are the most commonly encountered in this stratum. Herb diversity is usually high. <i>Aralia nudicaulis, Symphyotrichum ciliolatum, Eurybia macrophylla, Clintonia borealis, Cornus canadensis, Galium triflorum, Maianthemum canadense, Mitella nuda</i>, and <i>Trientalis borealis</i> are typical of this community. A Lake Superior clayplain variant may occur in northern Wisconsin.
Comm #793	Arctostaphylos patula Shrubland » more details accession code: urn:lsid:vegbank.org:commConcept:31604-{DB597014-5575-4C4B-8F46-A5182DBED37F}	NatureServe Biotics 2019	24	This association has been found mostly in southwestern Utah but observed in at least one stand in western Colorado. Most sites are on gentle to moderate slopes between 1770 and 2655 m (5800-8700 feet) elevation. The short-shrub canopy can have low to high cover (5-90%) but is consistently dominated by <i>Arctostaphylos patula</i>. Other shrubs may be found at low cover, including <i>Amelanchier utahensis, Artemisia tridentata, Ericameria nauseosa, Purshia tridentata, Quercus gambelii</i>, and <i>Tetradymia canescens</i>. The herbaceous stratum has sparse to low cover and is composed of species common to dry sites on the Colorado Plateau.
Comm #794	Populus fremontii – Salix laevigata Association » more details accession code: urn:lsid:vegbank.org/vegbranch:commConcept:28605-{64973F50-C5FE-41FA-A88D-1F0AC2277718} NOT CURRENTLY ACCEPTED	MCV2	24
Comm #795	Pinus palustris - Pinus serotina / Ctenium aromaticum - Muhlenbergia expansa - Carphephorus odoratissimus Woodland » more details accession code: urn:lsid:vegbank.org:commConcept:32530-{88393C10-5BFA-43D7-9225-7D3027EA9DDA}	NatureServe Biotics 2019	24	This saturated longleaf pine - pond pine woodland association is only found on wet Spodosols of the Atlantic Coastal Plain of North and South Carolina and possibly in Georgia. The open canopy is dominated by a mixture of <i>Pinus palustris</i> and <i>Pinus serotina</i>. The shrub layer is sparse to absent. Some characteristic components of the herbaceous stratum include <i>Ctenium aromaticum, Muhlenbergia expansa</i>, and <i>Carphephorus odoratissimus</i>.
Comm #796	Pinus taeda - Nyssa biflora - Taxodium distichum / Morella cerifera / Osmunda regalis var. spectabilis Tidal Forest » more details accession code: urn:lsid:vegbank.org:commConcept:33434-{870CC8C8-2BC4-47E4-B1B2-4F74ED921D98}	NatureServe Biotics 2019	24	This community occurs on relatively firm, poorly decomposed, fibrous and root-rich peat, which usually overlies soupy, well-decomposed peat at depths of about 0.5-1.0 m. Microtopography frequently exhibits a strong hummock-and-hollow pattern, with hollows retaining standing water through much of the year. Flooding by wind tides is frequent, and habitats may be inundated to depths of 0.5 m or more by occasional powerful wind tide events. This community may have complex long-term dynamics, related to inlet closing and opening. <i>Nyssa biflora</i> and <i>Taxodium distichum</i> dominate the canopy in variable proportions. <i>Pinus taeda</i> is also present and is diagnostic of this type in Virginia. <i>Acer rubrum</i> and <i>Liquidambar styraciflua</i> may also be important, especially in the subcanopy stratum. <i>Morella cerifera</i> is characteristically dominant in the shrub layer, sometimes reaching subcanopy heights (6-10 m). Other small tree and shrub components include <i>Persea palustris, Itea virginica, Clethra alnifolia, Vaccinium corymbosum, Rosa palustris</i>, and <i>Magnolia virginiana</i>. <i>Smilax laurifolia</i> and <i>Smilax rotundifolia</i> are common vines, and <i>Toxicodendron radicans ssp. radicans</i> also occurs. <i>Osmunda regalis var. spectabilis</i> is often the strong dominant of the herbaceous stratum, but also occurs in a more mixed condition with <i>Carex</i> spp., <i>Osmunda cinnamomea, Polygonum</i> spp., and <i>Thelypteris palustris var. pubescens</i>. In some areas, <i>Carex hyalinolepis</i> forms dense swards in this community.
Comm #797	Spartina alterniflora - Polygonum punctatum - Amaranthus cannabinus Salt Marsh » more details accession code: urn:lsid:vegbank.org:commConcept:35061-{5E831219-196F-4AF4-9CBC-F12FCAA06393}	NatureServe Biotics 2019	24	This oligohaline to mesohaline marsh of the Mid-Atlantic occurs in silty mud along meanders in tidal rivers and guts in the interiors of extensive marshes where there is significant freshwater input. The vegetation is diverse and variable but is characterized by the consistent presence of <i>Spartina alterniflora, Bolboschoenus robustus</i>, and <i>Polygonum punctatum</i>. Other associates include <i>Amaranthus cannabinus, Schoenoplectus tabernaemontani, Peltandra virginica, Pluchea odorata, Bidens coronata, Kosteletzkya virginica, Eleocharis palustris, Asclepias incarnata, Schoenoplectus americanus, Ptilimnium capillaceum</i>, and <i>Echinochloa walteri</i>. <i>Spartina cynosuroides</i> is a common associate in some areas of Maryland.
Comm #798	Fagus grandifolia - Acer floridanum - Quercus muehlenbergii / Sanguinaria canadensis Forest » more details accession code: urn:lsid:vegbank.org:commConcept:35464-{5E966F95-9900-4C8B-933A-441C084339C7}	NatureServe Biotics 2019	24	These rich mesophytic to submesophytic forests of calcareous ravines are found in the southeastern Virginia Coastal Plain and possibly the adjacent Piedmont. Habitats are north- to east-facing slopes and adjacent low interfluves downcut into Tertiary shell deposits or lime sands, including the Pliocene marine shell deposits of the calcium-rich Yorktown Formation. The canopies of stands of this association are typically dominated by variable combinations of <i>Fagus grandifolia, Acer floridanum, Quercus rubra, Quercus muehlenbergii, Tilia americana var. americana, Liriodendron tulipifera</i>, and <i>Quercus alba</i>. Although generally not as constant or abundant as <i>Fagus grandifolia, Acer floridanum</i>, and <i>Quercus muehlenbergii</i> occur in over two-thirds of the plot samples and are good diagnostic species. Characteristic or locally important understory species include <i>Asimina triloba, Magnolia tripetala, Ulmus rubra, Ilex opaca var. opaca, Cornus alternifolia, Cercis canadensis var. canadensis</i>, and <i>Carpinus caroliniana</i>. Common herbs are <i>Polystichum acrostichoides, Asarum canadense, Hepatica nobilis var. obtusa, Arisaema triphyllum, Actaea racemosa, Cardamine concatenata, Sanguinaria canadensis, Adiantum pedatum, Packera aurea</i>, and <i>Luzula acuminata ssp. carolinae</i>. The grass <i>Brachyelytrum erectum</i> is abundant and characteristic of more submesic habitats (e.g., convex north slopes) occupied by the type. Related vegetation occurs in the southern Piedmont of Virginia (Charlotte County).
Comm #799	Tsuga canadensis - Betula alleghaniensis / Veratrum viride - Carex scabrata - Oclemena acuminata Swamp Forest » more details accession code: urn:lsid:vegbank.org:commConcept:36591-{9AC5079E-9892-48BB-8221-F67ABAC1C781}	NatureServe Biotics 2019	24	This community is currently known from scattered sites in the Northern Blue Ridge and Ridge and Valley provinces of Virginia. Similar communities have been observed in the High Allegheny Mountains of Virginia and West Virginia, the Maryland Blue Ridge, and the Ridge and Valley of east-central West Virginia. Occurrences in Pennsylvania also seem likely. The type appears to be limited to higher-elevation montane wetlands in a portion of the Central Appalachians where <i>Rhododendron maximum</i> is infrequent to absent. Sites are usually located in high-elevation valleys or slope concavities, in diffuse stream headwaters and lateral, groundwater-saturated flats along larger streams. Occasionally, stands occupy gentle depressions or basins influenced by seasonally perched groundwater but without flowing streams. Elevation ranges from 670-1170 m (2200-3840 feet), though most occurrences are above 900 m (3000 feet). Habitats are flat to moderately sloping and typically have &gt;20% surface cover of boulders and stones weathered from metabasalt, granitic rocks, or sandstone. Stream-bottom habitats have pronounced hummock-and-hollow microtopography, with moss-covered mounds and intertwining roots of <i>Betula alleghaniensis</i>, mucky pools, and braided drainage channels. Canopy dominance is shared by <i>Tsuga canadensis</i> and <i>Betula alleghaniensis</i> in variable proportions. Minor canopy associates include <i>Acer rubrum, Fraxinus americana, Pinus strobus, Quercus alba</i>, and <i>Quercus rubra</i>. Small-tree and shrub layers are open to sparse, with <i>Acer pensylvanicum, Hamamelis virginiana, Ilex verticillata</i>, and <i>Kalmia latifolia</i> the most frequent species. <i>Alnus incana ssp. rugosa</i> is a dominant shrub in one sampled plot. <i>Rhododendron catawbiense</i> is scattered in some stands of this community in the southern part of the Northern Blue Ridge but does not form dense stands. The herb layer is well-developed and usually lush with forbs.
Comm #800	Diervilla lonicera - Solidago simplex var. randii - Deschampsia flexuosa - Hylotelephium telephioides - Saxifraga michauxii Grassland » more details accession code: urn:lsid:vegbank.org:commConcept:36593-{6A82B42E-27EC-40C2-8B55-C26278065512}	NatureServe Biotics 2019	24	This association is known only from a few high-elevation mafic rock outcrops in the northern Virginia Blue Ridge. All known sites are located in Shenandoah National Park. This community type is associated with exposed rocky summits and upper slope outcrops of Catoctin Formation metabasalt (greenstone) at elevations from 870 to 1230 m (2860-4040 feet). Slope shape is typically convex in at least one direction, and aspect varies from west to north. The vegetation is characterized by a patchwork of shrub thickets (typically &lt;25% cover), herbaceous mats (typically &lt;40% cover), and crustose lichen colonies on exposed rock surfaces. The most frequent woody species include extremely stunted, wind-blasted specimens of the trees <i>Betula alleghaniensis</i> and <i>Sorbus americana</i>; characteristic shrubs and woody vines are <i>Diervilla lonicera, Physocarpus opulifolius, Prunus pensylvanica, Prunus virginiana, Kalmia latifolia</i>, and <i>Smilax tamnoides</i>. <i>Deschampsia flexuosa</i> and <i>Solidago simplex var. randii</i> are the most frequent dominant herbaceous species, but <i>Sibbaldiopsis tridentata, Saxifraga michauxii, Carex pensylvanica</i>, and <i>Hylotelephium telephioides</i> dominate in some areas.